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Dipolar many-body complexes and their interactions in stacked 2D heterobilayers

Nature Reviews Physics (2024)Cite this article

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Abstract

In the past decade, dipolar many-body complexes have been observed in 2D van der Waals heterobilayers. These complexes show compelling dipolar characteristics such as long-range and anisotropic interactions among dipoles, and their high tunability and long coherence time make them promising for applications in quantum information processing and optoelectronic devices. The presence of powerful dipole–dipole interactions among long-lived interlayer excitons can cause the system to enter unique classical and quantum phases with multiparticle correlations, which can host rich many-body physics such as dipolar liquids, dipolar crystals and superfluids. The strong binding energy of interlayer excitons in 2D heterobilayers enhances the critical temperature of these exotic phenomena. In this Review, we discuss recent work on dipolar complexes and many-body effects in transition metal dichalcogenide double layers and present potential opportunities in the field.

Key points

  • Stacked 2D heterobilayers host many-body excitonic states with strong dipole–dipole interactions, enabling the investigation of multiparticle correlations and novel quantum physics.

  • The physics of dipole–dipole interactions in 2D heterobilayers is at the origin of several important phenomena, including Bose–Einstein condensation, superfluidity and supersolids.

  • 2D heterobilayers, with their long-range dipolar interactions, offer a promising platform characterized by distinctive tunability across various parameters, including interlayer distance, excitation densities, external fields, environmental stimuli and moiré superlattice structure.

  • The strong binding energy of dipolar complexes in 2D stacked heterobilayers allows for the pursuit of room-temperature condensation and superfluidity.

  • The impact of dipolar many-body complexes extends beyond excitonic physics discoveries and forms the basis of several key concepts, including Wigner crystallization, tunable quantum light emitters and scalable quantum devices.

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Fig. 1: Interlayer excitons and multicomplexes in 2D semiconducting bilayers.
Fig. 2: Dipolar repulsive interaction and modulation in carrier diffusion.
Fig. 3: Dipolar interlayer trions.
Fig. 4: Interlayer biexcitons and interactions.
Fig. 5: Exciton condensation in atomically thin double layers.

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Acknowledgements

The authors acknowledge funding support from the ANU PhD student scholarship, Australian Research Council (grant nos: DP240101011, DP220102219, DP180103238), ARC Centre of Excellence in Quantum Computation and Communication Technology (project number CE170100012) and the National Health and Medical Research Council (NHMRC; ID: GA275784).

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  1. School of Engineering, College of Engineering, Computing and Cybernetics, The Australian National University, Canberra, Australian Capital Territory, Australia

    Xueqian Sun & Yuerui Lu

  2. Department of Physics, Philipps-Universität Marburg, Marburg, Germany

    Ermin Malic

  3. Australian Research Council Centre of Excellence for Quantum Computation and Communication Technology, The Australian National University, Canberra, Australian Capital Territory, Australia

    Yuerui Lu

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Y.L. and X.S. conceived the study. All authors contributed to the writing and all aspects of the manuscript and were supervised by Y.L.

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Sun, X., Malic, E. & Lu, Y. Dipolar many-body complexes and their interactions in stacked 2D heterobilayers. Nat Rev Phys (2024). https://doi.org/10.1038/s42254-024-00721-4

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